Compressor pump



March 6, 1928.

l ven o.. vallas 7ans/m2?,

3311 Wwf.

COMPRESSOR PUMP Filed June 2. 1924 \\r n l l v D. D. PARsHALL HSM Patented Mar. 6, 1928. v

` COMPRESSOR rrr-nre AppuCamnnnea-i Julie 2,

The invention relatesto compressors more:z

lparticularly designed for use in connection and the invenwith.,1lefrigerating apparatus, 5 tion consists in the peculiar construction 'as hereinafter set forth.-

In the drawings:

Figure 1 is a vertical central section through the compressor in the axial plane of the cylinder and piston;

Figure 2 is a section on Figure l; and

the line 2-2 of Figure 3 is a: section on the line 3-3 of Figure l.

A is a cylinder of the compressor and B is the reciprocating piston therein. C 1s a detachable head for the cylinder, which is recessed to receive the outlet valve assembly D, and E is the inlet valve assembly which is mounted in the head of the piston."

The inlet valve assembly comprises a bush-k ing F which is arranged in an aperture in the piston head, preferably having a pressed fit therein. .Inthe upper portion of this bushing there is formed a conical seat Gr for a poppet valve H, which latter' has a p depending stem I passing through the bushing and threaded at itsrlower end for engagement with a stop nut J. This nut may be adjusted so as to limit the amount of rise permitted to the Valve and suchA adjustment can be effected priorto the installation ofthe bushing in the vhead of the piston.

The outlet valve assembly comprises a d fitvv disc seat member K having a presse within the recess in the head B and centrally apertured to ofthe gas. Above the disc VK is a spacer ring L and above this spacer ring an a ertured ring M engaging a shoulder N. is a disc valvewhich seats upon the disc `K and which is of a thickness of but slightly less than the thickness of the spacer ring L so as to provide only a limited lift for the valve. Thus whilethe lift is sufficient for the outward passage of the compressed gas, it is insufficient to produce a pounding or 'l noisy action in the lifting andvseating of the valve. The valve O preferably has a guide stem P, which loosely lits a vcentral aperture in the member yM.

With the construction as described, the

valve assemblies D and E" can be adjusted for the proper ylift of the valve before they are laced in the engine casing. The gas to be compressed is introducedintoV the cylinder below the piston B and, thereconsiderably:

'of the gas mum,

form a port for' the passage ffore,A during each? downwardafstroke i' of then,-

piston: the y,suctionl will 1j cause .f the .a upward.

lifting @fthe-valve -H anrlsthefvfpassage Vof y gas to above the piston.y The upward stroke of the piston will instantaneously seatthe valve H and will compress the gas against the valve 0, which is'held to its seat by whatever pressure of gas is in the systernl above` the valve. Also, the larea exposedA to gas pressure on thetop of the valve is greater than the area which is exposed yto the gas compressed in the cyl-V inder, so that the valvewill not lift from its seat until a considerably higher pressure is 'attained within the cylinder than that reviously compressed.V Therefore, when t e valve O does lift,` the compressed volume within ther cylinder is quickly transferred to the system above.-

The one advantage of the construction as described is that clearance in the compression chamber may be reduced to the mini-Y inasmuch as the valve H and its seat F are normally `flush with the top of the Y iston and the bo'ttomof the disk K is flush with the head of the cylinder. The only clearance is the volume of the port K which l is not a large factor. The usefof springs for seating the valves is avoided and,v there is nothing in the assembly to' get out of order after it is once installed. However, if necessary, each valve assembly can be removed from the compressor and replacedk by a new assembly.

What I claim as my invention is:

l. In a compressor pump,`a'cylinder and a reciprocator'y piston therein having a limited Aclearance* between the adjacent head faces, and inlet and outlet `valve assemblies locatedsin recesses in the respective faces and f lying flush therewith, said inlet valve being located in the piston and said outlet valve being located in the head `of the cylinder and comprising a disk forming a seat, a spacer above said disk, ya ported disk above said spacer having. a shouldered engagement with the head, and a valve located between said seat diskkand apertured disky and of a thick'- ness. but slightly less than said spacer to provide only a limited lift for the, valve.

2. In a compressor pump, a cylinder vand i pistontherein, and an outlet j an area considerably yin excess Vof thev area of the aperture through said seat, and means for limiting the lift of said disk from its seat without interfering with the exposure to gas pressure of the full upper face of the valve, whereby a compression pressure is attained in the cylinder correspondingly higher than the pressure above the Valve before'the lifting of the latter from its seat.

3. An outlet valve for a compressor pump comprising an apertured disk secured in the cylinder vbead and constituting a valve seat, a spacer above said disk, a ported-disk above Said spa-cer provided with a centrally dising a reduced eentralljy7 disposed upper portion arranged within the central opening of said ported disk for guiding the valve dur` Ving its movement to and from its seat.v

In testimony whereof I affix lmysignfra.- ture. f v

- DALLAS D. PARSHALLQ j 

